a.) The siren on a police car emits a sound of frequency fsound . If the police

Question

a.) The siren on a police car emits a sound of frequency fsound. If the police car approaches you at high speed with the siren on, the frequency you will hear is...

b.) When viewed in white light, the symbol on Superman’s chest consists of a red “S” on a yellow background. In red light, the "S" will appear                            [ Select ]                       ["red", "black", "yellow", "white", "blue"]         while the background will be                           [ Select ]                       ["white", "blue", "black", "yellow", "red"]         .

Explanation / Answer

a) higher than fsound because by Dopplers effect

f' = f ( v-vo /v-vs) where v is speed of sound vs is speed of police car.

b) the s will be appear red in red light as it is already red

The yellow background--- since yellow light is a mixture of red and green light, yellow will also reflect red and green light. This means that a yellow object will appear red under red light.

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.